221056621206036 has 192 divisors, whose sum is σ = 676936162560000. Its totient is φ = 54394025748480.

The previous prime is 221056621205999. The next prime is 221056621206049. The reversal of 221056621206036 is 630602126650122.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 866594640 + ... + 866849688.

It is an arithmetic number, because the mean of its divisors is an integer number (3525709180000).

Almost surely, 2^{221056621206036} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221056621206036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (338468081280000).

221056621206036 is an abundant number, since it is smaller than the sum of its proper divisors (455879541353964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221056621206036 is a wasteful number, since it uses less digits than its factorization.

221056621206036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304462 (or 304460 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

Adding to 221056621206036 its reverse (630602126650122), we get a palindrome (851658747856158).

The spelling of 221056621206036 in words is "two hundred twenty-one trillion, fifty-six billion, six hundred twenty-one million, two hundred six thousand, thirty-six".